weeks {quantmod} | R Documentation |
Extract weeks and years. This is a generic function, methods for zoo classes are documented here
## S3 method for class 'zoo': weeks(x, abbreviate) ## S3 method for class 'zoo': years(x, abbreviate)
x |
zoo object with index of class Date |
abbreviate |
abbreviate the results |
Behaves exactly as weekdays, months and quarters from base with the obvious difference in that the method extracts the weeks or years of the object.
A numeric vector giving the week number of the year corresponding to each
observed date for weeks
, and year in
CCYY-MM-DD format for years
.
The zoo object's index must be of class Date, or coercible to such.
Jeffrey A. Ryan
zoo
zoo.data <- zoo(rnorm(31)+10,as.Date(13514:13744,origin="1970-01-01")) weeks(zoo.data) years(zoo.data)